Granite rock towers shaped by mesh‐like joint sets, which formed in the shallower portion of a granite body during cooling at depth

Abstract Granite is fractured according to the stress state during cooling stage, providing predispositions for later topographic evolution. This study clarified that triangular mesh‐like joints can be made granite and they become structural causes formation of rock towers corestones on ground. Tengu rock, which consists in Hiroshima, was investigated using an unmanned air vehicle. The were shaped by high‐angle joints, likely are dominated three joint sets. All sets have sharp planar surfaces, suggests brittle fractures. One set cut other two sets, frequently accompanies aplite quartz veins developed whole exposed granite; this formed first then penetrated from depth. conjugate limited shallower portion pluton do not extend deeper, strongly a rapidly cooled pluton, probably near its roof. These form columns with parallelogram cross‐sections, incipient made. Subsurface weathering along subsequent exhumation products present only granite.